Last month, I was surprised when the location of Quick Actions (mini toolbar for common operations) was moved from between From and Sender to the right edge of the window. Not seeing any way to remedy this, I disabled them.
What does June bring us? They’ve killed Next and Previous, Jim. If you don’t like the preview pane and prefer to read one message at a time, you can no longer use the mouse to navigate through the message list. They’ve removed the arrows which used to be at the top right of the pane. Took a stab at searching on the web for this and didn’t come up with anything promising but did find an interesting post in the Answers forum at Microsoft.com about the Quick Action change mentioned above. The Microsoft Agent/Moderator says: “I’ve consulted our internal team about this case and it appears that this is a feature change on the website(Outlook.com), but according to the source we have they are waiting for customer’s reactions and this is the best time for you to send a direct feedback through Outlook.com website.”
If this keeps up, we will indeed have One (terrible) Outlook.